Think how nature makes things compared to how we humans make things." We talked about how animals don't just preserve the next generation; they typically preserve the environment for the ten-thousandth generation. While human industrial processes can produce Kevlar, it takes a temperature of thousands of degrees to do it, and the fiber is pulled through sulfuric acid. In contrast, a spider makes its silk - which per gram is several times stronger than steel - at room temperature in water.

— William Powers

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